Why would my teacher give me a math paper on something I didn't learn yet? Is she okay?

Mathematics

2 answers:

stepan [7]1 year ago

8 0

To see what you know, which is used to find out what you need to learn.

luda_lava [24]1 year ago

5 0

Answer:

your teacher is crazy about she think you are smart

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Solve by completing the square.

enot [183]

Answer:

x^2 -8x -5 = -3

x^2 -8x -2 = 0

We complete the square by:

1) Moving the "non X" term to the right:

x^2 -8x = 2

2) Dividing the equation by the coefficient of X²

The coefficient of x is 1 so we don't do anything

3) Now here's the "completing the square" stage in which we:

• take the coefficient of X

that is -8

• divide it by 2

-8 ÷ 2 = -4

• square that number

-4*-4 = 16

• then add it to both sides of the equation.

x^2 -8x +16 = 2 +16

That becomes

(x -4)^2 = 18

we take the square root of both sides:

(x -4) = sqr root (18)

x1 = sqr root (18) +4

AND

(x+4) = sqr root (18) -4

x1 = sqr root (18) +4 = 4.2426406871 + 4 = 8.2426406871

x2 = sqr root (18) -4 = = 4.2426406871 - 4 = .2426406871

Step-by-step explanation:

8 0

2 years ago

4m≥m+9>-9+4m Please answer urgent

Vsevolod [243]

Next time, please include the instructions.

This inequality could be broken into two parts:

4m $\geq$ m + 9 AND m + 9 > -9 + 4m

Focus first on the inequality m + 9 > -9 + 4m. subtract m from both sides, obtaining:

9 > -9 + 3m. Next, add 9 to both sides, obtaining: 18>3m, or m<6

Last step: Determine whether the inequality 4m≥m+9 is true if m<6.

5 0

2 years ago

Someone please help me. I don't have a pen and paper to work this out

earnstyle [38]

I hope this helps you